package com.swn.common.util;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *  Cookie工具类,封装Cookie常用操作
 *  
 * @author 
 * @version v 0.1
 */
public class CookieHelper {

    /**
     * 设置cookie有效期，根据需要自定义[本系统设置为30天]
     */
    private final static int COOKIE_MAX_AGE = 1000 * 60 * 60 * 24 * 30;

    /**
     *
     * @desc 删除指定Cookie
     * @param response
     * @param cookie
     */
    public static void removeCookie(HttpServletResponse response, Cookie cookie)
    {
            if (cookie != null)
            {
                    cookie.setPath("/");
                    cookie.setValue("");
                    cookie.setMaxAge(0);
                    response.addCookie(cookie);
            }
    }

    /**
     *
     * @desc 删除指定Cookie
     * @param response
     * @param cookie
     * @param domain
     */
    public static void removeCookie(HttpServletResponse response, Cookie cookie,String domain)
    {
            if (cookie != null)
            {
                    cookie.setPath("/");
                    cookie.setValue("");
                    cookie.setMaxAge(0);
                    cookie.setDomain(domain);
                    response.addCookie(cookie);
            }
    }

    /**
     *
     * @desc 根据Cookie名称得到Cookie的值，没有返回Null
     * @param request
     * @param name
     * @return
     */
    public static String getCookieValue(HttpServletRequest request, String name)
    {
            Cookie cookie = getCookie(request, name);
            if (cookie != null)
            {
                    return cookie.getValue();
            }
            else
            {
                    return null;
            }
    }

    /**
     *
     * @desc 根据Cookie名称得到Cookie对象，不存在该对象则返回Null
     * @param request
     * @param name
     */
    public static Cookie getCookie(HttpServletRequest request, String name)
    {
            Cookie cookies[] = request.getCookies();
            if (cookies == null || name == null || name.length() == 0)
                    return null;
            Cookie cookie = null;
            for (int i = 0; i < cookies.length; i++)
            {
                    if (!cookies[i].getName().equals(name))
                            continue;
                    cookie = cookies[i];
                    if (request.getServerName().equals(cookie.getDomain()))
                            break;
            }

            return cookie;
    }

    /**
     *
     * @desc 添加一条新的Cookie信息，默认有效时间为一个月
     * @param response
     * @param name
     * @param value
     */
    public static void setCookie(HttpServletResponse response, String name, String value)
    {
            setCookie(response, name, value, COOKIE_MAX_AGE);
    }

    /**
     *
     * @desc 添加一条新的Cookie信息，可以设置其最长有效时间(单位：秒)
     * @param response
     * @param name
     * @param value
     * @param maxAge
     */
    public static void setCookie(HttpServletResponse response, String name, String value, int maxAge)
    {
            if (value == null)
                    value = "";
            Cookie cookie = new Cookie(name, value);
            if(maxAge!=0){
            	cookie.setMaxAge(maxAge);
            }else{
            	cookie.setMaxAge(COOKIE_MAX_AGE);
            }
            cookie.setPath("/");
            response.addCookie(cookie);
    }
}
